Hi, Annie.

To my understanding, I suppose you shouldn't care about reciprocity while making pre-exposure. This is usually a short exposure at higher values than you find at low zones. Maybe, it can even supress further corrections, as the extended exposure is just supposed to increase density at those critical zones and pre-flash always reduce contrast, a major problem on reciprocity failure. A simple test, with roll film, may show you after a set of exposures, with and without pre-flash, how these variables meet. The fact that different emulsions show different reactions to both actions, makes testing even more appealing.
I hope this help.